SPECIFICATIONS:
Thread diameter:4mm(1/5”)
Total length: 40mm(1-3/5”)
Head diameter:7mm(3/10”)
Head thickness:2.5mm(1/10”)
Head angle:90 degree Thread Type: Flat Head (standard)
Point Type: Self-tapping
Head Type: Flat
Quantity: 100 pcs
Material: 304 Stainless Steel
Note for newbies:
1. Before installing the screw, please use the drill to open a small hole and then install the screw.
2. In the installation process encountered obstacles, do not force installation, it is recommended to first withdraw the screw, and then slowly operate!
Precautions
1. The taper of the reaming should be 90°. To ensure the guarantee, it is better to be less than 90°, not more than 90 °. This is a key trick.
2. If the thickness of the sheet metal is less than the thickness of the head of the countersunk head screw, the screw of the smaller one can be replaced, or the hole can be reamed smaller or not, and the diameter of the bottom hole becomes larger, so that the part pressure is not tight.
3. If there are multiple countersunk screw holes on the part, it should be precise when machining. Once the drill collar is drilled, the assembly is difficult to see, but as long as the error is not large, it can be tightened, because if the diameter of the screw is not very tight when tightening Large (approximately no more than 8mm), when there is an error in the hole pitch, the screw head will be deformed due to the force when it is tightened or it will be tightened.